JPS579154A - Malfunction preventing system for fsk communication - Google Patents

Malfunction preventing system for fsk communication

Info

Publication number
JPS579154A
JPS579154A JP8323480A JP8323480A JPS579154A JP S579154 A JPS579154 A JP S579154A JP 8323480 A JP8323480 A JP 8323480A JP 8323480 A JP8323480 A JP 8323480A JP S579154 A JPS579154 A JP S579154A
Authority
JP
Japan
Prior art keywords
circuit
post
signal
carriers
noise
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP8323480A
Other languages
Japanese (ja)
Inventor
Saburo Kamei
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP8323480A priority Critical patent/JPS579154A/en
Publication of JPS579154A publication Critical patent/JPS579154A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/14—Demodulator circuits; Receiver circuits
    • H04L27/156—Demodulator circuits; Receiver circuits with demodulation using temporal properties of the received signal, e.g. detecting pulse width
    • H04L27/1563—Demodulator circuits; Receiver circuits with demodulation using temporal properties of the received signal, e.g. detecting pulse width using transition or level detection

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

PURPOSE:To prevent the malfunction due to noise, by adding the front and post carriers to a FSK signal, and switching the gate of AND circuits within the present period of the front and post carriers. CONSTITUTION:An FSK signal added with front and post carriers is applied to a zero crossing amplifier circuit 2, comparators 3, 4, integrator 6, comparator 7, and FF10 via a BPF1. When the FF10 is set, the output of the circuit 2 is applied to a demodulator 12 and a logical processing circuit 13. The circuit 13 outputs a reception confirming signal g and resets the FF10 after the processing time. The signal g is the timing signal before the stop of the post carrier, but since the FF10 has the priority for reset, an AND circuit 11 is closed. Thus, the malfunction due to noise after the stop of the post carrier can be prevented.
JP8323480A 1980-06-19 1980-06-19 Malfunction preventing system for fsk communication Pending JPS579154A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8323480A JPS579154A (en) 1980-06-19 1980-06-19 Malfunction preventing system for fsk communication

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8323480A JPS579154A (en) 1980-06-19 1980-06-19 Malfunction preventing system for fsk communication

Publications (1)

Publication Number Publication Date
JPS579154A true JPS579154A (en) 1982-01-18

Family

ID=13796628

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8323480A Pending JPS579154A (en) 1980-06-19 1980-06-19 Malfunction preventing system for fsk communication

Country Status (1)

Country Link
JP (1) JPS579154A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0715439A3 (en) * 1994-12-01 1997-11-19 Nec Corporation Decision device for burst-mode receiver

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0715439A3 (en) * 1994-12-01 1997-11-19 Nec Corporation Decision device for burst-mode receiver
US5838731A (en) * 1994-12-01 1998-11-17 Nec Corporation Burst-mode digital receiver

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